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seestar: Selection functions for spectroscopic surveys of the Milky Way
Everall, Andrew; Das, Payel
Selection functions are vital for understanding the observational biases of spectroscopic surveys. With the wide variety of multiobject spectrographs currently in operation and becoming available soon, we require easily generalizable methods for determining the selection functions of these surveys. Previous work, however, has largely been focused …
The path to Z And-type outbursts: The case of V426 Sagittae (HBHA 1704-05)
Masetti, N.; Munari, U.; Buil, C. +16 more
Context. The star V426 Sge (HBHA 1704-05), originally classified as an emission-line object and a semi-regular variable, brightened at the beginning of August 2018, showing signatures of a symbiotic star outburst.
Aims: We aim to confirm the nature of V426 Sge as a classical symbiotic star, determine the photometric ephemeris of the light min…
The XXL Survey. XLIV. Sunyaev-Zel'dovich mapping of a low-mass cluster at z ∼ 1: a multi-wavelength approach
Chiappetti, L.; Berta, S.; Altieri, B. +61 more
High-mass clusters at low redshifts have been intensively studied at various wavelengths. However, while more distant objects at lower masses constitute the bulk population of future surveys, their physical state remain poorly explored to date. In this paper, we present resolved observations of the Sunyaev-Zel'dovich (SZ) effect, obtained with the…
Multi-wavelength campaign on NGC 7469. V. Analysis of the HST/COS observations: Super solar metallicity, distance, and trough variation models
Kaastra, J. S.; Kriss, G. A.; Arav, N. +18 more
Context. AGN outflows are thought to influence the evolution of their host galaxies and their super massive black holes. To better understand these outflows, we executed a deep multiwavelength campaign on NGC 7469. The resulting data, combined with those of earlier epochs, allowed us to construct a comprehensive physical, spatial, and temporal pic…
The Age Dependence of Mid-infrared Emission around Young Star Clusters
Calzetti, Daniela; Lin, Zesen; Kong, Xu +9 more
Using the star cluster catalogs from the Hubble Space Telescope program Legacy Extragalactic UV survey (LEGUS) and 8 µm images from the IRAC camera on the Spitzer Space Telescope for five galaxies within 5 Mpc, we investigate how the 8 µm dust luminosity correlates with the stellar age on the 30-50 pc scale of star-forming regions. We …
CS Cha B: A disc-obscured M-type star mimicking a polarised planetary companion
Snellen, I. A. G.; Ginski, C.; Girard, J. +6 more
Context. Direct imaging provides a steady flow of newly discovered giant planets and brown dwarf companions. These multi-object systems can provide information about the formation of low-mass companions in wide orbits and/or help us to speculate about possible migration scenarios. Accurate classification of companions is crucial for testing format…
APEX observations of ortho-H2D+ towards dense cores in the Orion B9 filament
Miettinen, O.
Context. Initial conditions and very early stages of star formation can be probed through spectroscopic observations of deuterated molecular species
Aims: We aim to determine the ortho-H2D+ properties (e.g. column density and fractional abundance with respect to H2) in a sample of dense cores in the Orion B9 s…
Foreshock Cavities at Venus and Mars
Zhang, Tielong; Futaana, Yoshifumi; Frahm, Rudy +7 more
"Foreshock cavities" are regions of turbulent and heated solar wind plasma that form upstream of Earth's bow shock. Despite being common at Earth, none have yet been reported at other planets. Here we present a survey of events encountered by the ESA Venus Express spacecraft consistent with foreshock cavities at Venus and a case study of a foresho…
First results from MFOSC-P: low-resolution optical spectroscopy of a sample of M dwarfs within 100 parsecs
Homeier, D.; Allard, F.; Kumar, Vipin +4 more
Mt Abu Faint Object Spectrograph and Camera (MFOSC-P) is an in-house-developed instrument for the Physical Research Laboratory (PRL) 1.2 m telescope at Mt Abu, India, commissioned in 2019 February. Here we present the first science results derived from the low-resolution spectroscopy programme of a sample of M dwarfs carried out during the commiss…
Seasonal and Hemispheric Asymmetries of F Region Polar Cap Plasma Density: Swarm and CHAMP Observations
Reistad, J. P.; Laundal, K. M.; Haaland, S. +6 more
One of the primary mechanisms of loss of Earth's atmosphere is the persistent "cold" (T≲ 20 eV) ion outflow that has been observed in the magnetospheric lobes over large volumes with dimensions of order several Earth radii. As the main source of this cold ion outflow, the polar cap F region ionosphere and conditions within it have a disproportiona…